linux-kernel - Re: [PATCH v4 00/24] ILP32 for ARM64

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Message-ID: <20150416142703.GD819@e104818-lin.cambridge.arm.com>
Date:	Thu, 16 Apr 2015 15:27:03 +0100
From:	Catalin Marinas <catalin.marinas@....com>
To:	"Dr. Philipp Tomsich" <philipp.tomsich@...obroma-systems.com>
Cc:	Andreas Kraschitzer <andreas.kraschitzer@...obroma-systems.com>,
	Arnd Bergmann <arnd@...db.de>,
	"Pinski, Andrew" <Andrew.Pinski@...iumnetworks.com>,
	Andreas Schwab <schwab@...e.de>,
	Alexander Graf <agraf@...e.de>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Andrew Pinski <apinski@...ium.com>,
	Kumar Sankaran <ksankaran@....com>,
	Benedikt Huber <benedikt.huber@...obroma-systems.com>,
	linux-arm-kernel@...ts.infradead.org,
	Christoph Muellner <christoph.muellner@...obroma-systems.com>
Subject: Re: [PATCH v4 00/24] ILP32 for ARM64

On Thu, Apr 16, 2015 at 01:19:14PM +0200, Dr. Philipp Tomsich wrote:
> Just for the record (and to avoid anyone wasting their time on what’s available
> today): we are migrating this over to option (a) now, even though we would
> prefer to see option (b) implemented.
> 
> If we get a consensus on (b) in the next couple of days, we’ll redo things for
> option (b). If not, we will have an implementation for option (a) available that
> we can hopefully all agree on merging.

When you post, please include the libc-alpha list (I think they are fine
with cross-posting), maybe only for the cover letter as that's where the
useful discussion seems to happen.

It's interesting to re-read some older posts on x32 (it's not just
time_t affected, though probably that the most visible):

https://lwn.net/Articles/457089/
https://sourceware.org/ml/libc-alpha/2012-03/msg00487.html
https://sourceware.org/ml/libc-alpha/2012-03/msg00574.html

Basically for x32 POSIX compliance doesn't seem too critical. IIUC, the
x32 wasn't added to solve a 32-bit compatibility problem but as a
potential optimisation for specific cases.

On ARM OTOH, (one of?) the main goal for AArch64 ILP32 is to offer a
solution for 32-bit code when AArch32 is not present (and potentially
slightly more optimal than AArch32 but not necessarily when compared to
LP64).

-- 
Catalin
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